I had already tried another brand (BlueBonnet) which is also iron bisglycinate. Both are of excellent quality. I started taking iron because I'm hypothyroid and my ferritin levels were on the low side. My blood tests show an increase since then, and I can confirm it works because the fatigue has decreased and I no longer feel like fainting when running.

And very detoxing because it has vitamin C and glycine in the formula. Also very easy to take, I can even give it to my girlfriend who never wants to take supplements. I complement it with magnesium glycinate at night and so far so good.

If you have Hashimoto's (autoinmune thyroid malfunction) this may work for you. I've tried several brands of plain L-Tyrosine but they all made me jittery in the end, not with this formula, and I've noticed a decrease in fatigue and a remarcable mood improvement.

Provides a noticeable mood boost. This is a must for anyone with thyroid/adrenal issues. One of the few supplements that actually works. Don't overdo it though. I've found that one capsule taken first thing in the morning on an empty stomach (1 hour before eating anything) is all I need.
There is another product from Thorne called Thyrocsin which has l-tyrosine in it, but it was impossible for me to take it on an empty stomach due to nausea from some of the other ingredients.